/Engine/Plugins/Experimental/ChaosClothAsset/Source/ChaosClothAsset/Public/ChaosClothAsset/CollectionClothFacade.h
This will remove the 3D vertices, but the associated seams and 2D vertices will still exist, and point to INDEX_NONE
void RemoveSimVertices3D ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & SortedDeletionList )